SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf61d84e853ba9141e0a2ce000ff517429cad15729b193ff0608ffce860fe609' 
  AND token = 'BJn7244PKh4KBU24/1WZP9gD8jtVspln/r4EnGHYIp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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