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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c3d81bfaa35b9821808ea238d6cd63d747bba3884dc19e940af2fdf34b95aaf' 
  AND token = 'nD4sj9eHvAfUj6IrMQNYluTx1lFLrODVAgV9csS/Dcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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