SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91dc56757634273dca6b05c4a1098af4926b361aad5f647799c2cd4398ed1228' 
  AND token = 'cjIVX84dhFHAza1C4xSsh0fDCtGyj/bWVzSl/WuUDDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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