Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fdf405e828a506ee5e94e380e8bdab297adfbf24f72844096d878df8115f290' 
  AND token = '9wgRdKpjKztjG04py47z1lsdjH+/6bj9vrOX5yRE4zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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