SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01ff71626e4f15213d6564470abdc98cabe9a6bf41eb0e0a8361366f7fc3b4ba' 
  AND token = '02ZX5WAuDC2SlJQ2zqjQr458jgU5Kj2ydK7iRefGVCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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