SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14d944386a8e6b61e139c632e254a524e7a7a31d960cedc9794cbc15b6da165f' 
  AND token = 'NKHgFLQ017HIioFcqGD3CKeqYlFqbnvXh7mVpz/byrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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