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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '033d6e997c237a413b7db1f43c0492d92bbf1aa30f46ee16a7e98e83e96b9f20' 
  AND token = '3tR73c57omYHmCA/5pypXNj35v4omG7DxXO3YQHC9O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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