SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6409f41bde2d842cd78dad74455c8d111a447ae6e3879cc7c894d2107323f40' 
  AND token = '8Da2kZGbUHHGiIHplHlRGBjyvvGVOjXHGEOJjLxBStY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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