SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48f5b0a9acb1768e150b6b5175fe6d88ad299058f64bc61b55369a302daee12c' 
  AND token = '2IG+KeUVH6K0SKZ6jsJDQ7soGRoXTVgQx8CSrpKBLa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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