SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91daae57c0691368b61f64b62910039ca3ad85269e9bd26d983f27014945fc29' 
  AND token = 'zOv0OaHneUGezBppe+J+D6TXcxzqLDFf/oIhYYAtXa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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