SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adba9fe54888993403f6a85eb22d385576653d6fde020bb94176a1f1dc21e97b' 
  AND token = 'Uh4SESBSgmRpLKsXUpxaK6VFHZlU8gZ+KSo0rZ5KBNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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