SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63d433bbc7da8c487d77fafc7141ca5c02b69169109c534cfd48ed221bf14804' 
  AND token = 'KiXn98tyPYv7dlv1ezz6DDYymAprCtmpVFpjmUBIkmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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