I have been trying to find a way to create a never expiring FaceBook Page Access Token. I have seen the option where you provide the AppID|AppSecret in place of the token h
After piecing together many different solutions - I did this and it seems to work. I assume you only want a token for a single page and that you already have your Facebook app page setup.
Get the ID of the page by navigating to it from a web browser, click on About link in the menu list down the left hand side of the page, then scroll to the bottom of the About information and you will see the Page ID display.
Navigate to Facebook Graph API Explorer
Remove everything after the API Version (in this case v3.2) on this line of the explorer
and replace it with 123456789?fields=access_token where 123456789 is your page ID.
Click the Submit button to the right hand side of the line you just entered the text into.
{ "access_token": "TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT", "id": "1755746091324056" } where TTTTTTTT is your access token.
After pasting in the new access token click on the blue information icon to the left of the access token.
In the Access Token Information dialog, click on the 'Open in Access Token Tool' button at the bottom right of the dialog.
I hope this helps.
PS - Here is what I see in Facebook's Access Token tool when I paste the token generated using this method into it. It says this token will never expire.