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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce60490f3bb313b7ccc7fcc60251136ce3cb51ebe4022a45588e66884a7cfb3' 
  AND token = 'B20XxuLHAqqwFk20x1CnjGziuwZOffRdCmPiWOUZLH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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