SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e5b2e30877eb818dd4a338690448fec5fa09b892eb64c0292625adf99f307cf' 
  AND token = 'TsJY8Yy3o1Ve+uFoJ62b3RyB/xGKAI9pweSUq0DXV0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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