SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c28d3c6e787c616fafc25f63aad94220e3e69328afc39e46bd9c946e0590c7e1' 
  AND token = 'BVY5A+sWPhexslqVAqKh+htRzJgxzZH6etgb7tNi5/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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