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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd6c877aaf09d42911a0893008a3c5c674a811044bc716ff70f124c24ef17315' 
  AND token = 'TPL74YOxpvH78DjczQqs6/NllV9jXa5gi8puDeFZFxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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