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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59b6600564df05c35265e96ccfe166e050446c761937ca2ce87aeee9aef442a9' 
  AND token = 'WX6Vm08dbu7SSZB/5LqLz+7DIf9lVupEYS/5NQLXZxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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