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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cd6ea05134f1b3069d813d3ca418463ec40e1c9bba1311ccdf2ce99f646e1f4' 
  AND token = 'sDuIPlBLd7mW+GoI4aEth6Kppo+1NyI5gh/2EhgXy7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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