Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3439773db5c36a390311f025e16c8236d1744da12d5e67cc522e88ba9e87ad8' 
  AND token = 'Ymjcg3udmSdBMfWCuH7H/XoMYyEy+1taPU5paEodffo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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