Will it be possible to create no expiration tokens in the future?

No, the creation of new long-lived access tokens is now deprecated, and will be retired in the future.

For reference, we don't currently have a plan to disable existing long-lived access tokens though. (If that changes, we will of course announce that ahead of time.) That being the case, you can continue using existing long-lived access token(s) without interruption. Note though that after the change you won't be able to create new long-lived access tokens.

You can find more information in this post.

ОК, thanks. What is the expiration time of refresh tokens?

Refresh tokens don't expire automatically, though they can be revoked by the app or user.

What I need - thank you.