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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac8123ebf6331d123b3f9ece380806b238aeb1896ebe9ef5a7e0e1a8a2533604' 
  AND token = 'm8Uynt0OiDo75hvVn5cZ4NgEReKtA5mxeimWdMtfTuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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