SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7e967f40adb957359291ada1db7b3eb90cf485986445c2eaf11d2764f2d7d35' 
  AND token = 'mrjSS6qoALElib6VFKH1JXl7j63uTJ/8GGBFFUHaN1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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