SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a83cb6488313c00f93fee19cf15202a6cdbb74ce5758975a159c6acf0f15094' 
  AND token = 'gv5XMhV7qnvlXLA7zIRJgiE1Fn8Os+XHfQ09vlkCxGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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