SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11e5c229c33d6c4e86ae6e588772ec7af3d7fa60776c58ef69d0ac9bbf72a821' 
  AND token = '5/Z7jJxYjpmjiVWlhCVNeOC0MRJz8OB0DVZUdljhxzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00263

JSON explain

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