SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383f20413b39a9e9770306ed518cd97b959033b600e9cba42a4e6c4e9a191cd3' 
  AND token = 'A4qd2fsivZPXQjU4V+AQOFvv4idG5YzqqqKLAGAJMmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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