SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9283ae44114e1cf49d8fb19fb186bd2a665336a525f3b95d12b5d091eae185e7' 
  AND token = 'D61Az5NW2sVKlHgJGwrwXiuwvP2BOREPykZmJH9wR7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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