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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ece23402cc4cb50fcfce08dd241ccfc8a75f4d4d3379941270d5b88d8a6722cc' 
  AND token = 'FP0aTtif8K5ae+q162B83oFxf8P7EzHtCIdgVTtfDw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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