SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e99eb8335eda06bb0e95372ddcf9a407379dcc162dc48ca41b9978351badbab' 
  AND token = '3yNvQBFh0HPJfziyKwTY51bjMCXlKuWVtw3t+cZ4Pow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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