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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97830741645fe7bd127e943d47d092adc224e06294c77ba240ca240a98776afe' 
  AND token = '3XRicd/9W02ShXI/TI7S8fxaQMlLlFZ1lBwWndIB4Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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