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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce7093a38c9c5cd3a43e76b05cdc5d9f6dba1058aaccf819b09728c30d6df31a' 
  AND token = '9pg5HS47o/Dka7KMZ9UOCE5zNZMH8lMTXRzYTxHf3+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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