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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2be476c69319ef9e4e905ab8983bff5bd39440ad42db5b5d008b259ce3cbbb6f' 
  AND token = 'N6bs7HKQPzHv6P0ZQZ36/6WZoTAXJba/sAge7BwM+tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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