Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a404b1f9391d4468b8045223837e4d43bbc7cfcc0dd4a83de722ad86cc09448' 
  AND token = '3KDizWL0c8tL0kUjZfewTix5XFFCo/PBK0HZQqWn7tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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