SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17815ea2ec55d085566809290448f4489b53d3b122327d38e1849e88f3aa05ce' 
  AND token = 'KUoLgCQ3JhPK0VbwojQdSEKAFQqjZ8JG9A2m4ESopbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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