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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e949ff51cffccf27064e64ebc37a4f68900124114aca55d793138f446fb0f3f3' 
  AND token = '2HYQCsvcgmGgl03ztCI74lWG06IaU91hpl96f0WDyEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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