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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4915a43b3e6443bd0afa78977952f124443219720d511de0c259e690d4551c9e' 
  AND token = 'ulDXVh3wE5zt17DpXt0MZQjxGmu9H3k3SNhIgBRDho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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