SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58aa343095c4d48fb1264e9da5393ddf812f7d9b5de42a84bc8dd8eefc0fe243' 
  AND token = 'htLrZxmz6ClwVHvGbOvgmbFgfD33IKus6+XVr6n2TU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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