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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6734475636b7039835b0f26ed4124b750ca217eee895eb5ef3d6c35498d78e87' 
  AND token = 'AfQ6U9xjnPipqM+59OW3kvjIZg8WaCdepD07BpJ30YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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