SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fd7469dd3b7915461bcac48aa95732978f1f3624343ff17f5a59523dbe27629' 
  AND token = 'ggj7DX1FTZwjxkqkKu46l9zj7EHxBgQAVnBt1qicCb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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