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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '259ce9afc050bfba9790e31df9f48b0b36b46d6cdc83a5784235d3533847694a' 
  AND token = 'VDnlHu8T78ePd2kO6tLcaaxXkSFbM+Q72ZoICHhh7s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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