SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc6aeb9ff04bbd153510680fd7709902af7c272150f2d2b342ac8e9561ddc1b8' 
  AND token = 'BZAH/6BlqZPd+GrZghyCnILgGFORyT/xA6uiX1MK1E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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