SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96d4c9861e8187b86ef038b5835d95688ab4f6ebe45faadac8cd7f5fd60d9264' 
  AND token = '2JCvalpuy3izKsbEtgApZbRvFGH72B+cdGD2wMHYDh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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