SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '801f0818bf9859c9e8f02489c436071470f597be869d35bf77bbcf1edd981340' 
  AND token = 'jR2E09GV6hAJK3gHYNpgoa7fwnhkUXrDbBXvUwSlHB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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