SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af8f25ef895f29c9ba3c6ea28b9916d6cf21a971703b1e61b1d6daf131804f57' 
  AND token = '47MzQa8+4+SMgmN+kXzs7ToowBCl7TJ7sRhJmq0ZICg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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