SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '327806107415432644b425f61e6803b9ebeffebd67ec6555ec7b17b25d536c3f' 
  AND token = '+h3IudwrZ7pR0pC21MliQFyVwd69TlHz8EAwUg4mquU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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