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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2783bf820eefeb43e337ed0081e3fc3d6ed7f41121dd39c8dfc022ff3bcf218a' 
  AND token = 'DAIxPKfkfsbzh7S1igKoGlu6p7nqNfTQ+p42cQPGtqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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