SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcff9315506cf90baa84d6cf8b672c7105cf0c28628b5dec25960cc671d03935' 
  AND token = 'F2ZEW4KLzp/LJWAvV1ofIU1mXx/Uk2VYuucZPhvv/3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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