Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff45ea0ca1a32373f5b463b54f5cb5598f0ab76fdea536bc57e46a18cf5defa7' 
  AND token = 'SUSewKiyUnGl8nuENEs4qCZF4cFlsZb8rPgpVTrY8PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}