Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ff4a9ad3b098b53066d43391a5fca4d6f4429ce64e2fa08fadea20d2f91a39' 
  AND token = 'UwNGONoo1O0NXd0zUnigASyrhZ+VQpg+qrErwD9fANU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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