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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5815a895598e12acc41837132d8bb6cdbaaec1864cbac783860bfe7524f4bfbf' 
  AND token = 'bXtfRoQG460FBc+y5zwXH7nLHT3uDU0UPeTgKtEO30w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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