SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bab8bc595f01aee9e738fe574fcd30e655b5db13b0df73c1d7627129354bbdc9' 
  AND token = 'XQtD/kK4i0QOvjddTeXJYo4CLsvVzs2HoAeqQm6CiZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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