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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b318dadce921462625bfd709e6605283b41d433040512d5582decb525664084' 
  AND token = 'K8PaqKHEkszeCcpAdEERZpYEo2gzox7+oy0JKMq/9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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