SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55d27f8adba23ea2352b07800fd57eda7b7c789f1b97a44bd4cec71b24a949ed' 
  AND token = '0P10jX1XchJZQkE+GKgpqvcsxJnQ50Nza1BQbPeqDJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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