SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f904d2b380010237518434c6d8e723a858cf9de160acc84616afbf6406f2fe91' 
  AND token = 'UsbNW+bklLOGu0sQRo1aVgZK8kKv597vGbmRUTcAbJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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