How to prevent or adjust Access Token expiration OAuth 2.0

How to prevent or adjust Access Token expiration OAuth 2.0

I have built a form in Creator that pulls data from a 3rd party API when a user inputs a unique case number.  Upon user input of that field, I have scripted an API call that pulls in corresponding data and auto-populates several other fields in the form.  The dataset I am using includes personal data, so I am following OAuth 2.0 and using an access token that I generate through the 3rd party API.  While I have this script working, I cannot seem to find a way to keep that access_token from expiring after an hour.  The API I am using does not support refresh tokens, so I can only imagine that there is some sort of background process in Zoho that expects a token refresh every hour.  Not sure, just my best guess.  Is there a way to keep this access token from expiring, or at least to increase the expiry duration?