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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a82ba3b6a5e9c42c1002c9b5fb2de9189b931db12a0743f2daed0bf58cdf1d81' 
  AND token = 'WAkEsUoLaBSllVV8mgqtuGmttBL+YODb49Y/TjEl94g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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