SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22b6aff19764ee36e788fac5407dbb3f1e63feb4a68991d419b8bed852c86efd' 
  AND token = 'l356QnL4a+OmXHp/UVQJb3gLld+PaLlGBXHjZcQMSKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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