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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5a5bf049a9598641297b47da0f45e8dbe4193c35bbb6a74adf0821d17c1e77c' 
  AND token = 'TZJSYFrLvsTTXgP/nY4Wf1n8xamlxeNxdMDFJxHYWbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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