SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c8cf4e967f1b5a3f7dbeb859fb66c3a01bbbea91e3598c684b93ab9fdfa617a' 
  AND token = 'LGh3B3XnRJdj2IqwblN9Mw2/lAKEMM+fA/IqpQ6oFzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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