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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17afb6acceef26664a66da75e4f1a88ece35d911ec244fa209b114a406bef223' 
  AND token = '+QoW9ks9Umj5aJN3OOTw4mKKxdkvMh6RzteVK5qKt3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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