Increase access token after successful use but X minutes. This is for WordPress OAuth Server. Place this snippet into your themes functions.php file. It taps into the authenticated action WP OAuth Server uses when checking authorization of a call.

autoexstendtoken.php

/**
 * UPDATES AN ACCESS TOKEN'S EXPIRE TIME BY X AMOUNT OF TIME WHEN SUCCESSFULLY USED FOR AUTHENTICATION
 *
 * NOTE: This will override any token settings used within the plugin but does allow for active tokens to
 * stay active instead of expiring. This is useful for auto deauthentication tht is traditionally handled on the
 * client side.
 */
add_action( 'wo_endpoint_user_authenticated', 'wp_oauth_successful_authentication_action' );
function wp_oauth_successful_authentication_action( $token ) {
	//$current_expires = $token[0]['expires'];
	$access_token    = $token[0]['access_token'];
	$minutes         = 30;
	$new_expires     = date( 'Y-m-d H:i:s', current_time( 'timestamp' ) + ( $minutes * 60 ) );

	global $wpdb;
	$update = $wpdb->update( $wpdb->prefix . 'oauth_access_tokens', array(
		'expires' => $new_expires
	), array( 'access_token' => $access_token ) );
}