Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a6f7bd3901e9c7898ee2e38505809b7b8145cb23e879a20c10bfb2be131d8f1' 
  AND token = '3kfYilc0o2bitKaH5xtedpgAUAZ/e04pk//0zWxlKFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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